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f;.1 Extended |
initial writing: 2000-11-17 |
The dyads x f;.n y for n e. 1 _1 2 _2 has been extended
to accept a boxed left argument, to effect cuts in multiple axes.
x is a boxed vector with up to #$y
elements such that >i{x is a boolean vector
that specifies how axis i is to be cut.
An empty vector on a non-zero axis specifies the entire axis.
For example:
y=: i.5 7
(<1 0 1 0 0) <;.1 y
+-----------------+--------------------+
|0 1 2 3 4 5 6|14 15 16 17 18 19 20|
|7 8 9 10 11 12 13|21 22 23 24 25 26 27|
| |28 29 30 31 32 33 34|
+-----------------+--------------------+
(1 0 1 0 0;1 0 0 0 1 0 1) <;.1 y
+-----------+-----+--+
|0 1 2 3 | 4 5| 6|
|7 8 9 10 |11 12|13|
+-----------+-----+--+
|14 15 16 17|18 19|20|
|21 22 23 24|25 26|27|
|28 29 30 31|32 33|34|
+-----------+-----+--+
('';1 0 0 0 1 0 1) <;.1 y
+-----------+-----+--+
| 0 1 2 3| 4 5| 6|
| 7 8 9 10|11 12|13|
|14 15 16 17|18 19|20|
|21 22 23 24|25 26|27|
|28 29 30 31|32 33|34|
+-----------+-----+--+